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    .box {
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      margin: 0 auto;
      background: #000;
      display: flex;
      width: 500px;
      height: 500px;
      padding: 100px;
      flex-wrap: wrap;
      /* 主轴上的对其方式 */
      justify-content: space-between  ;   
      /* 主轴的方向 */
      flex-direction: row; 
      align-content: flex-start 
      
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    .item  {
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      height: 50px;
      border-radius: 50%;
      background:coral;  
      margin-left: 50px;
      margin-top: 20px;
    }
    /* span:nth-child(2) {
      align-self: center;
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    .column {
      display: flex;
      /* 占据主轴空间 */
      flex-basis: 100%;
      justify-content: space-around;

    }
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